Message Board for PC version

Ok so earlier today I was playing Left 4 Dead, never hacked it once before and I had probably 45 achievments. When I got on to play again I clicked Versus and it recommended me to play campaign mode first? I also have no achievments, and every time I click on Campaign or Survival it says "Stopping search"!

What happened?

"And Dethalias said to the people of the low plains, 'Seek not the wickedness amongst your neighbors lest it find purchase in your own house.'"